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This is very common. Labor and employment-related work typically bills at even lower rates. Many large law firms have moved away from doing labor and employment (unless it is defending class actions) because the billing rates are so much lower in this practice area. There are also fewer corporate attorneys than there are litigators, for example. Most attorneys that go to law school end up becoming litigators--few become corporate attorneys. Therefore, because there is a lower supply there is less competition. For major corporate deals, there are also a small list of firms that are considered the "go to firms"--compared to firms that do litigation--and large companies prefer to use brand names in important transactions to ensure nothing goes wrong.